98 lines
3.3 KiB
Python
98 lines
3.3 KiB
Python
import re
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class InvalidMenuMessageError(Exception):
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"""
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Custom exception raised when a menu can not be parsed correctly.
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Usually happens when trying to parse a random message like "Estamos de vuelta!!!")
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"""
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def __init__(self, message):
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self.message = f"Invalid message while parsing into a menu, message: '{message}'"
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super().__init__(self.message)
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def parse_menu_message(message: str) -> list[list]:
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"""
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Using `menu=parse_menu_message(my_message)`, `menu[0]` are the options for the first course (`menu[0]=["Pasta a la boloñesa", "Ensaladilla rusa"]` for example). `menu[1]` is the same but for the second course
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:param message: Will receive a message's content as sent in the telegram channel.
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:returns: A list of lists with the options for each course.
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"""
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message = re.sub(r'\n\s*\n+', '\n\n', message)
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lines = message.splitlines()
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if lines == []:
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raise InvalidMenuMessageError(message)
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first_line = lines[0].lower()
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first_line_is_header = "menu" in first_line or "menú" in first_line
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if first_line_is_header:
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lines.pop(0)
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# Remove the newline after the header if it exists
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if not lines[0].strip():
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lines.pop(0)
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# Initialize this to none in case we don't get it
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course_separator_index = None
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# Check if course separator is a blank line
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for i, line in enumerate(lines):
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if not line.strip():
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course_separator_index = i
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break
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if course_separator_index is None:
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# Old menus use - for first course and > for second course, or otherwise
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second_course_char = '-' if lines[0][0] == '>' else '>' if lines[0][0] == '-' else None
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if not second_course_char is None:
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for i, line in enumerate(lines):
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if line[0] == second_course_char:
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course_separator_index = i
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break
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if course_separator_index is None:
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raise InvalidMenuMessageError(message)
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# Some messages have "TAMBIEN PARA LLEVAR" at the end of them
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last_line = lines[-1].lower()
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if "llevar" in last_line or "preguntar" in last_line:
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lines.pop()
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def fix_line(line):
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# Remove first character if it is not a letter (- and > are common in 2023). Leading whitespace might appear, will be deleted later
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line = re.sub(r'^[^\w]+', '', line)
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# Strips the line (leading and trailing whitespaces on menu items are common)
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line = line.strip()
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# Replace occurrences of "c/" with "con " (if extra space was added it will be removed after)
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line = line.replace("c/", "con ")
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# Remove extra whitespaces in the middle of the string
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line = ' '.join(line.split())
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# Remove trailing dot
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if line[-1] == '.':
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line = line[:-1]
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# Capitalize
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line = line.capitalize()
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return line
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lines = [fix_line(line) for line in lines if line.strip()]
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# First two lines are first course, and second two ones are second course
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first_course = lines[:course_separator_index]
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second_course = lines[course_separator_index:]
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if len(first_course) <= 1 or len(second_course) <= 1:
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raise InvalidMenuMessageError(message)
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courses = [first_course, second_course]
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return courses
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